Only run workflows when necessary (#4790)

* Run workflows only when necessary

* submod

* also run tests on yml change

* aba bab abab ababa

* give up

* give up 2

.github/workflows/build-test.yml

@@ -3,8 +3,22 @@ name: Build & Test
 on:
   push:
     branches: [ master ]
+    paths:
+      - '**.cs'
+      - '**.csproj'
+      - '**.sln'
+      - '**.git**'
+      - '**.yml'
+      - 'RobustToolbox/'
   pull_request:
     branches: [ master ]
+    paths:
+      - '**.cs'
+      - '**.csproj'
+      - '**.sln'
+      - '**.git**'
+      - '**.yml'
+      - 'RobustToolbox/'
 
 jobs:
   build:

.github/workflows/validate-rsis.yml

@@ -1,6 +1,9 @@
 name: RSI Validator
 
-on: [pull_request]
+on:
+  pull_request: 
+    paths:
+      - '**.rsi/**'
 jobs:
   validate_rsis:
     name: Validate RSIs

.github/workflows/yaml-linter.yml

@@ -1,6 +1,7 @@
 name: YAML Linter
 
-on: [push, pull_request]
+on: [pull_request, push]
+
 jobs:
   build:
     runs-on: ubuntu-latest